Current studies have exposed the capability of flavonoids to influence transportation of vitamin C around the body, and also assist to control the role of an enzyme called ascorbate oxidase, which converts vitamin C into non vitamin type.

A large number of metal containing proteins, such as hemocyanin (a Cu metal containingprotein present in some invertebrate animals which helps them in the transport of O2;like hemoglobin in humans) retain metal ions in their active sites so a great interest is developed in such metal containing enzymes which are ureases, laccase, tyrosinase and ascorbate oxidase [5-9] containing enzyme urease (urea amidohydrolase EC 3.

In regard to uric acid, it should be pointed out that vitamin C can interfere with the standard colorimetric uric acid assay, though excess ascorbate oxidase is usually added during the assays to prevent this.

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